Color conversion filters such as the 81 warming series and 82 cooling series are one type of filter you do no longer need. Their effect can be duplicated in-camera by simply adjusting the white balance.
You may skip the color conversion filters like 80A, FLD and 85C, since you get these by adjusting the camera's white balance. This is an advantage of digital, since you don't lose the stop or two of light that these filters absorb.
Color conversion filters like the warming 81A and 81B are indeed relatively easy to simulate, but to equate the effect of a ND grad may require more than wizardry, although I've seen it done fast and most effectively by Dave Black, ...
Color conversion filters: Color filters used to correct the color temperature of a light source to suit the color balance of films.
Color temperature: Scale measured in Kelvin that is used to express the color quality of a light source.
For example, the dark blue B12 Nikon filter makes it possible to use daylight balanced film with tungsten studio lamps, changing the light temperature from 3200K to 5500K. In digital photography the light color conversion filters effect can be added ...
Soft focus filters soften the focus to make portraits more flattering and to make hazy, romantic landscapes.
Close-up lenses magnify the subject without affecting aperture settings.
Color conversion filters let you fine-tune the way you capture ...
 See also: Filters, Blue, Conversion filter, Color, Color conversion filter
  
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